Chusetts



Patented Apr. .18, I899. s. m. LINDSAY & a. SAUNDERS.

FURNACE ATTACHMENT.

(Application filed Sept. 12 1898.) (No Model.)

(a INVEgZOH; 49%;!- By M A 77'ORNEYS.

WITNESSES UNITED STATES PATENT OFFICE.

GEORGE M. LINDSAY AND GEORGE SAUNDERS, OF ANDOVER, MASSA- CHUSETTS.

FURNACE ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 623,408, dated April 18, 1899.

Application filed September 12, 1898. Serial No. 690,756. (No model.

To all whom it ntay concern:

Beit known that we, GEORGE M. LINDSAY and GEORGE SAUNDERS, of Andover, in the county of Essex and State of Massachusetts, have invented a new and Improved Furnace Attachment, of which the following is a full, clear, and exact description.

This invention relates to attachments for heating-furnaces; and the object is to provide a simple attachment by the use of which all cold air will be drawn from the hot-air flue or pipe by the furnace-draft, the same draft serving to force the hot air through the flue or pipe, thus resulting in an equal distribution of the hot air.

\Ve will describe a furnace attachment embodying our invention and then point out the novel features in the appended claims.

Reference is to be had to the accompanying drawing, forming a part of this specification, in which the figure represents a perspective view of a heater or furnace, showing our invention as applied thereto.

Referring to the drawing, 1 designates a heater or furnace of any desired construction and from the upper portion of which a hotair flue or pipe 2 leads to a register, here indicated as arranged in the'floor of a building. In the drawing we have shown two hot-air tlues; but it is obvious that a greater or less number may be employed. From the flue or pipe 2 a tube 3 leads to near the bottom of the heater or furnace and provides communication between said flue and the heater or furnace. This tube is provided with a damper 4, and it preferably communicates with the flue 2, as shown in the drawing, at thejunction of the vertically-disposed portion and the horizontally-disposed portion of said flue.

Our improvement is to be applied only to such of the fines 2 in which no proper draft is obtained. This defect is observed particularly with very long fines and is due principally to the large amount of cold air contained in the more remote or upper portion of said flue, which cold air, particularly when w and also on account of the upward draft ex-' isting in the furnace. A good draft will thus be started in the main flue 2, and the cause of the defect above mentioned is effectively removed. As our return-tube'is wholly outside the hot-air line, there will be no obstruction of said flue.

Having thus described our invention, we a claim as new and desire to secure by Letters Patent- 1. The combination with a heater or furnace, and a hot-air flue leading upwardly therefrom and open at its upper end, said flue having an approximately horizontal portion, of a tube communicating with the interior of said flue on the lower side of the horizontallydisposed portion, and also communicating with the heater near the bottom thereof.

2. The combination, with a heater or furnace and a hot-air flue extended therefrom, the said hot-air flue having a horizontallydisposed and a vertically-disposed portion, of a tube communicating with the interior of said fine on the lower side of the horizontallydisposecl portion at the junction of the horizontally and vertically disposed portions, and also communicating with the heater or fur nace near its bottom, substantially as specified.

GEORGE M. LINDSAY. GEORGE SAUNDERS. lVitnesses:

A. L. DICK, H. S. WRIGHT. 

